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So’n Doong Cave (Mountain River Cave in Vietnamese), is the biggest known cave in the world, by volume. It is located near the Laos-Vietnam border.
Tags » Natural Wonders
Want to visit the most popular national parks and nature preserves around the world?
You’ll have a lot of company.
More than 8 billion people visit national parks and nature reserves every year, and visitors to those protected areas generate more than an estimated $600 billion in tourism dollars annually, according to a new study on the impact of global visits to protected areas. 253 more words